Benedict becomes 1st pope in 600 years to resign

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VATICAN CITY, ITALY - FEBRUARY 28: Nuns wave as the helicopter carrying Pope Benedict XVI passes by St Peter's Square on February 28, 2013 in Vatican City, Italy. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He will stay at the Papal Summer residence of Castel Gandolfo until renovations are complete at a monastery in the grounds of the Vatican and will be known as Roman pontiff emeritus or pope emeritus. (Photo by Carsten Koall/Getty Images)